Ceramics - Processing, Reliability, Tribology and Wear,

This day the improvement of technical ceramics is usually orientated in the direction of a greater regulate of the microstructure and ensuing houses of those fabrics. New kinds of powders and microstructures are constructed to let the use of ceramics in new program areas.
This target will be reached by means of generating competently reproducible reactive powders, improvement of tailored sintering methods, and by means of introducing new sorts of composites. moreover, new tools supply new possibilities for fabrics improvement.


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Extra info for Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

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The density decrease was caused by formation and growth of intergranular pores. Corresponding to the density 22 decrease, the amounts of emitted gases for samples sintered in air and Ar tended to increase. The density decrease is concluded to be caused by entrapped gases in the sintered bodies through a pore coalescence process. 6 Acknowledgements This work was partially supported by a Grant-in-Aid from the Ministry of Education, Science and Culture of Japan. 7 References 1. Itoh, J. Japan. Metals, 59, 296-302 (1995) 2.

First the strength of the particles bond differs. The coarse particles of the support have a sufficient bond at high temperature. On the other hand the fine particles of the membrane layer sinter too strong at the same temperature. At low temperature the membrane layer shows an adequate strength, but the coarse particles of the support are insuffiently connected. Second the different shrinkage of the support and membrane layer often result in distortion and formation of cracks. Ceramics – Processing, Reliability, Tribology and Wear.

Using a polyelectrolyte dispersant good dispersion and stabilizing of the glass powder and the fine SiC powder are reached. In the case of the coarse SiC powder for the support the electrostatic and steric stabilizing by the colloidal particle interactions play a secondary role. Rather the slurry viscosity must be adjusted so highly that the coarse particles do not sedimentate. Typical viscosity curves of both tape casting slurries are presented in figure 3. The developed binder system meets the usual demands regarding slurry stability and rheology, drying and handling of the tape.

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